right folks, went to replace the weeping oil sight glass today. drilled a hole in the outer plastic and then went in search of a 'screw type thing ' to screw through the holes in the back and pull it out. I happened to find a cork screw in my tool box ( as you do ), It worked a treat, however on closer inspection the cork screw had snapped in two and the end had fallen into the bowels of the engine
I retrieved it by removing the front cover of the engine so not all lost. just took longer than expected. doh.
So.......don't use a cork screw